Re: (ET) E16 drive issues.

[Dean Stuckmann <dstuck lakefield net>]

Hi,
Well its not the motor or the F relay, but I did find a resistor broke in 
half on the small square varistor card. Could that be it? Does anyone know 
the values of the components on that card? The one that is broke is smoked 
and I can’t see a number. 

Thanx for your help
Dean


On Sep 22, 2014, at 9:10 PM, RJ Kanary <rjkanary consolidated net> wrote:

>               Since this is an E-16 there is no longer a Field Reversing 
> relay. The only relay in the Field circuit on these is the Field 
> Weakening relay. With the Armature reversing contactors, the Field 
> circuit became much simpler.
> 
> RJ
> 
> 
> On 9/22/2014 9:14 PM, CZ Unit wrote:
>> On 9/22/2014 9:01 PM, Dean Stuckmann wrote:
>>> Hi,
>>> Thanx for the help.
>>> 
>>> Here is some more info. I did the motor testing with the motor just on 
>>> the ground. So there was NO resistance from belts or the transmission. 
>>> Could that cause the runaway? But like I said it worked fine in 
>>> reverse. In reverse the torque made the motor jump as it got up to 
>>> speed almost immediately. In forward, the motor started at just a few 
>>> RPM for the first few seconds but then started revving up to runaway 
>>> after about 5 more seconds.
>> 
>> The problem is there is no power to the field when in forward. If the 
>> E16 uses the E15 type of field control there is a relay that is 
>> probably welded shut in the reverse position. Thus when you try to go 
>> to forward there is no field. If it's an E20 type controller then there 
>> are two diodes that provide constant power to the field in forward and 
>> reverse. One of them blew up.
>> 
>> The E15/20 motor is not really a shunt motor, it's a compound motor. 
>> There is a shunt field that supplies almost all the power, and a small 
>> field in series with the armature that acts as a compensating control, 
>> increasing field strength past normal full field when the motor is 
>> heavily loaded. With the normal field gone that little remaining field 
>> winding will provide enough to spin the motor very quickly with no load 
>> and not at all under any load.
>> 
>> C
>> 
>> 
>> 
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> 
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